Expansion joint cover structure



Feb. 23, 1965 c. P. BALZER ETAL. 3,170,268A

- EXPANSION JOINT covER STRUCTURE lliled Nay 7, 1962 2 sheets-sheet 2 K Afro/Mfrs bodiments of this invention. i

United States Patent O i 3,170,268 l v EXPANSNIHJ CUVER STRUCTURE Claude i). Balzer, Edward lvl. Corman, andAlvin A. Reti?, Wichita, Kans., nssignors to Balen, lne., Wichita, Kans., a corporation of lliansas` Filed May 7,; No2, Stier.- No. '192,882 '7 Claires. (til. dil-T73.)

This invention relates to building structures of the type having expansion jointsin portions thereof such asin walls and/or ceilings,fand more particularly to cover structures for such expansion joints. j

It has been the practice' in building structures having portions thereof of monolithic concrete, concrete blocks,

bricks and the like, in order tovprevent cracks in the structure due to expansion and contraction, to make the portions in sections with expansion joints to accommodate the expansion and contraction. Such joints have presented difficulties as they can beunsightly and provide `problems in .protectingA the interior Vof the structures from atmospheric conditions `such as snow, rain and the lil;e.f -At' tempts have beenmade to provide strips to cover the expansion joints, but those heretofore used have been difiicult to use and install, have been lunsightly both on VtheV interior and exterior of the buildingand, in many instances, are inecient in providing suitable protection. In some such structures, the covers are incorporated 1n v the joint itself, providing difficulties in replacing and repairing the cover members.

The principal objects of the present invention are to proy vide ail-expansion joint Cover structure adapted to cover expansion joints between sections Vof a wall'an'd/ or ceiling and eliminate the difliculties above-mentioned; to provide such an expansion joint cover structure adapted to cover an expansion.ijointlbetween sections of a wall and/ or ceiling having concrete, concrete blocks, brick or metal or combinations of them; to provide suclr a structure that includes a mounting member securedto av section of wall `-`and/or ceiling adjacent the joint andavcover member mounted on said mounting member 1n covering relatlon'` thereto-and having a portion extendingiin overlapping.

relation to the joint and the other section of Wall at said i joint; to provide such a structure. wherein the mounting `or Vbase member 'and cover memberhavel interengagmg portions with means for resiliently retaimng same 1n enl gagement for retaining the cover member on the base member; to provide such `a' structure wherein the cover member is snappedv ontol the basemember and retained thereon Without auxiliary. fastening devices; to provide such a structure wherein the exposed surfaces have no visible fastening means; to provide such a structure that Other objects-and advantages of-this invention will be- 'come apparent Vfrom the -following description taken in connection with the accompanying drawings whereinpare set forth byway of illustration andy lexample'certain` ern- VFIG. 1 is a partial perspectiveview of an expansion joint cover structure embodying the features `of the present inventioninplace onA the interiorlofa building wall in covering relationffto:.anexpansion joint between twosec- 7o tia cover structure and Wall portions taken on the line 242,-

FIG. 1. i .Y

FIG. 3 is a sectional view through the expansion joint cover means similar to FIG. 2 with the cover and base members in partially assembled position-as the cover member is moved into position on the base member.

FlG. 4 is a partial perspective view of a form of expansion joint cover structurein place on the interior of av building to cover an expansion Vjoint ybetween two sections of a wall arranged in angular relation. j

FIG.\5 is a sectional View through the expansion joint cover structure, taken on'theline 5-5, FIG. 4.

Y FlG. 6 is a sectional View through the expansion joint cover structure shown Vin. FIG. 4 in partially assembled relation in position as the cover member is moved into position on the b ase member.

Referring more in detail to the drawings: y .l The reference numeral 1 generally designates a portion of arbuilding structure having sections 2 and 3 separated by an expansion jointe. The sections 2 and 3 may be wall orceiling sections and may be of monolithic concrete, building block, brick, metal or combinations thereof or other suitable material. ln the structure illustrated,

the Wall .sections 2 and 3 have faces Sand o respectively,

and Vthe expansion joint cover, structure generally desig- Y nated with the reference 'numeral 7 when mounted covers the expansion joint Ai,- as'shown in FIGS. l-to `3 inclu-V sive. The expansion joint .structure normally extends from floor to ceiling except when broken by a window or door or lfrom wall to wall except when broken lbyV other installations or fixtures.`

The expansion joint structureV includes a base member 8 preferably formed of metal in an elongatedI Strips as for example by aluminum extrusion. The base member .includes a at strip or plate portion-9 having' aface itiadapted to engage the V.face of a Wall section, as for ex-.V

ample the face 5 of the section 2, the base memberpreferably being'seeured to the ksection `along the joint 4 by suitable fastening devices il vspaced longitudinally along the plate 9. Inthe illustrated structure, the fastening devices l1' are in the form of bolts each having a Vshank V12 that extends through respective apertures i3 inthe plate portion 9 and threadedly engaged in nutsV i4 recessed inV holes 15 in the Wallk section 2, the nut beinganchored in' said sectionwhen it is concrete by a suitable manner, as for example a bushing or. other expansion member lo.

Thev base plate portion 9 has outwardly projecting laterally spaced members 17 andllt and, in the-illustrated structure, themember 17 extends longitudinally `of the stripportion 19 along an edge i9 and has a leg portion 2@ extending outwardly'from the base *portion/'S` V'and lterminates in a leg portion 2l that extends toward the yopposite side of the strip portion 9.' An inwardly extendj ing lip 22 is arrangedfon the free end of the leg 2li, said lip terminating in spaced relation to the. plate member 9 tofprovide an elongate entry opening 23. It is alsopreferrerlv thatthe lip portion 2?. have an inclined face 24 to facilitate4 entry ofacover portion into theopening l2,3,

as later described. The base plate portion9, legs 2li and.'

2l and -lip 22 denne arecess ilhaving an access openin'gQZf -andfadapted to receive a resilient member 26.'

The-member :1S is longitudinally ofthe plateportion 9 and extend-s Ioutwardly from the edge 27 of the plate portion 9 and terminates in an inwardly extending portion or lipA v Zforming a ledge 29 facing the plate portion 9. Itis preferred `,that-the lip portion 23 have its outer end surface inclined as at 3@ to facilitate entry of' cover portions,

j asflateifV described. It is preferredtha't thevn'iembersr. 17 and-18 be co-extensive with the` plate portion 9 whereby fthel `structure Visnadapted,tobe formedby extrusionV of FIG.;2jis a lsectionaljvievv.through the eiqn'ransionjoint' ,suitable metalsuch as aluminum,jlmagnesiumyor the'like;

"Patenten Een. 2s, ieee however, it is to be understood that the structure contemplates any suitable form of fabrication and that the members 17 and 18 may be interrupted along the length of the base member.

The expansion joint cover structure includes an outer or cover member 31 of suitable width to be engaged with the base member and have a portion overlapping the joint 4, as illustrated in FIG, 1. In the structure illustrated, the cover member 31 includes a substantially tlat elongate plate or strip member 32 preferably presenting a smooth outer face 33. Extending inwardly from the plate portion 32 are laterally spaced longitudinally extending members 34 and 35 adapted to be positioned inwardly of the base member portions 17 and 1S. The cover member also has inwardly extending flange-like members 36 and 37 that extend longitudinally of opposed edges of the plate portion 32. In the structure illustrated, the member 34 extends from the plate portion 32 oppositely from the face 33 thereof and has a laterally turned or outwardly extending flange or rib 3S adapted to extend through the opening 23 and engage the resilient member 26 whereby said resilient member urges the member 34 and the cover member 31 toward the member 1S. The member 35 also extends from the plate portion 32 oppositely from the face 33 and is adapted to be positioned inwardly of the member 13 and terminates in a laterally extending portion 39 forming a ledge adapted to engage the ledge 29 to form an interengagement cooperating with the member 34 vto retain the cover member on the base member. The flange or edge member 35 is spaced outwardly from the base member 17 to provide suitable clearance and has an inner edge portion 36 in spaced but close proximity to the surface of the section 2 when in joint covering position. Suitable seal means 40 may be suitably mounted or carried by the cover member and slidably engage the wall sections. In the illustrated structure, the edge or flange member 37 has a channel 41 extending longitudinally thereof with a narrow opening 42 toward the wall section 3. Outwardly from the opening 42 the flange portion has an extension 43 that isV adapted to be positioned in spaced relation but close proximity to the surface 6 of the wall section 3 when in joint covering7 position. A resilient seal member 40 is positioned in the channel 41 and has portions 44 extending through the opening 41 and adapted to engage the surface 6. In the illustrated structure, the seal member is in the form of an elongate body member 45 positioned in the channel 41 and the portion 44 is a thick pile extending through the opening and adapted to engage the surface 6 with some resiliency that would tend to urge the adjacent portion of the cover member outwardly from the wall section and thereby cooperate with the interengagement of the ledge portions 39 and 29 and the resilient member 26 in maintaining the cover member in position.

In assembling a structure constructed and illustrated as described, the base member 8 is preferably mounted on the face 5 of the section 2 with the member 18 extending along one side of the expansion joint 4, the base member being secured to the wall section by suitable fastening devices suchv as thebolts 11, it being understood that leaded holes or other suitable anchoring means may be used to provide secure and convenient mounting on the material of the wall section. The cover member 31 is` then moved into overlying position relative to the base member with the member 34 thereof positioned as illusj trated in FIG. 3 wherein the flange 38`engages the re- 'silient member 26, the cover member being of such Width that when assembled the flange portion 36 is arranged whereby the cover member covers the base member, the expansion joint and said flange portion 37 overlies the surface 6 of the wall section 3. The cover member 31- is then forced toward the member 17 of the base member to compress the resilient member 26 until the member 35 will pass inwardly of the member 18 whereby` the cover member can be swung toward the wall sections and engage the pile 44 with the surface 6 of the section 3. The cover member is then released whereby the pressure exerted by the resilient member 26 biases the cover member toward the member 18 to effect engagement of the ledges 29 and 39. In this position, the height of the member 17 from the surface 5 of the section 2 is such that the inner face 46 of the plate portion 9 substantially engages the surface 47 of the flange 38 to aid in positioning said cover member and co-opei'ating with the resilient member 26, the pile 44 and the ledges Z9 and 39 in retaining the cover member 7 in the position as illustrated in FIG. l. The pile 44 provides a seal between the edge portion of the cover and the wall section 3 and it is to be understood that if desired the same type of seal could be applied to the flange member 36 to seal both sides of the cover and wall section joints. Also, other suitable seals such as rubber or resilient plastic, caulking or the like may be used to meet particular requirements and conditions of the installation.

In the form of the invention illustrated in FIGS. 4 to 6 inclusive, the expansion joint cover structure 4S is adapted for use in corners to cover the expansion joint 49 between sections 50 and 51 which can be either wall sections or ceiling sections wherein one section extends at a right angle to the other section with the expansion joint 49 therebetween. In this structure, the base member 52 has a plate portion 53 adapted to be mounted on a face 54 of the wall section 50 and secured thereto by suitable fastening devices such as a bolt 55. The base member also includes a plate portion 56 that extends therefrom and is adapted to lay across the face 57 of the wall section 51. This positions the base member portion 56 to properly cover the joint 49. The cover mounting portions on the baseA plate 56 are substantially the same as illustrated and described relative to the embodiment in FIGS. 1 to 3 inclusive, with the portion 17 adjacent the base plate portion 53 and forming a cavity containing the resilient member 26. The ledge-carrying member 13 extends longitudinally of the base member 52 at the opposite side thereof from the plate member 53 and extends outwardly of the plate portion 56 in the same direction or substantially parallel to the plate portion 53. It is preferred that the outer edge of the base plate member 53 have an outwardly extending flange 5S extending outwardly relative to the face 54 of the wall section 50. A cover member or outer member 59 is mounted on the base member 52 in substantially the same manner as in the embodiment illustrated in FIGS. 1 to 3 inclusive. The cover member 59 includes a plate portion'60 having inwardly extending members 34 and 35 adapted to engage the resilient member Z6 and the ledge-carrying member 18 respectively to secure `the cover plate to the base member. The cover plate or member has a plate portion 61 extending substantially at right angles to the portion into overlying relation to the llange 58 and terminates in a flange portion 62 disposed outwardly from the flange 58 and extending toward the surface 54 of the wall section 50,1said ilange 62 terminating in spaced but close proximity to the surface 54, as illustrated inV FIG. 5. Also, the plate portion 61 in assembled relation is in close proximity to the end edge of the flange 58. The plate portion 60 of the cover member extends beyond the member 35 and has an inwardly extending flange 37 whichj arranged on the flange portion 6 2 of the cover member to seal both sides of the cover relative to the wall scctions, if desired.

The assemblyY ofthe expansion ljoint cover member in ent isi the ledge portions engaged and thecover member -on-the base member-in a position substantially as illustrated in FIG. 3. Y

As will be readily evident, ithe `expansion joint cover structures may be completely Vinstalled after the walls and ,ceiling-of a building have been,constructed,` and that after the base member is installedthe cover @member can f be. quickly and easily applied with a snap-on action-Without auxiliary fasteners or tools and is characterized by an absence of visible fastening means extending Vthrough any of the external portions ofthe cover platemembers. Also, the cover members can be easily-,removed for repairing or replacing by` reversingthe installation pro-1 cedure, that Visby applying force to the cover'member to compress the resilient membersiysufficien'tlylto release' the interengagement of theledges and 39 1 and then said cover member can be bodily removedl from the-base member. Y,

VItisY to be understood that while I,we have ,i1lustrated and `described certain forms of ourfinyention, it is not to be limited tothe specitic form or arrangement of parts herein described and shown exceptinsofar assuch limitations are includedin the claims. WhatV we claim l.,An expansion joint cover :assemblyfor structural sections disposedin spaced relationship `and' fdeinir1g an elongated joint therebetween, said assembly comprising,

and desire to secure by' Letters-Pat- (n) an elongated relatively rigid Ibase ,memberradapted p to be mounted on the outer: face of one of; the struc- '40 ftural sections adjacentthe margin thereof, )(b) spaced longitudinally extending'fnrstrandvsecond member portions on said b ase'memberzandprojecting outwardly therefrom, (c) vone of said lirst and second'memberportions having" an extension toward the other Vot Vsaid member portions and Vcooperating with the'base member to define a longitudinally extending cavity, (d) the second of said'member portionshaving' an extension toward the tirst memberportion and delining a ledge facing theibasermember and spaced'therefrom, i e' (e) an elongate resilient member positionediinsaid 'cavity'betw'een the firsty member extension and the lbase member and having Va face exposed toward said 't second member portion, (f) an elongated relatively rigidcovermemberover- .lying said base memberandjhavin'g a width extending laterally therebeyondfto overlie the joint between fsaid `structural sections Iand alongitudinal :segment vof the `other structural section'inproximitylto said jointf" j ,l 'y f (g) said cover memberrhaving aplurality of laterally spaced longitudinally*extending member `portions `-fprojecting toward said base member,

' (l1) .a pair of said memberporti'ons' on the cover- Inernber being positioned inwardlyof saidrst and` second ember portions on the base member Aand fhaving 1 Aspacing `for lateral movement relativethereto,`

von .the .base member; ,and

*0) ledge meeinenA the. other@ saidpi effinember `cover member towardthe second'rnelrmberjgxjrtion portions jonthe cover member to complementarily Lengage the ledge portion on the Second member portion of the base member in interlocking relationship thereto in response to lateral movement of the cover member effected by the resilientmember for cooperating therewithto retain the cover member on the base Vmember. 2'. An expansion joint cover assembly for structural sections disposed in spaced relationship and defining an elongated joint therebetween, said assembly comprising,

(a) an elongated relatively rigid base member adapted to be mounted on the outer face-of one offthe structural sections adjacent the margin thereof,

(b) spaced longitudinally extending lirst and second member portions on saidbase member andprojecting outwardly therefrom, l(c) one of said lirst andl secondV member portions `having ari-extension towardthe-other of said member portions and cooperating with the base member to Y define a longitudinallyextending cavity,

V,(d) an elongate resilient member positioned in said cavity between the -lirst member extension'fandthe base member and having a face Vexposedtowardsaid second member portion, i

(e) an elongated relatively rigid covermemberoverlying said base member and having a width extending laterally therebeyond to overlie the joint between said structural sections and -a longitudinal segment of the other structural section Iin proximityto said joint:

(f)V said cover member havingafplurality of'laterally spacedv .longitudinally extending member portions projecting toward said `base member', l

(g) a pair of said member portions onthe cover memberi'being positioned inwardly of said lirst and second fr .member .portions on ythe Vbase vmemberandhaving spacing for lateral movement relative thereto,

t (h) one of said pair rOfmernber Iportionslonthe 'cover member having ian extension extending into the" cavity y j)'I said cover'member having a-thirdfprojecting longi-i tudinally extending memberfportionfspaced transversely @of the cover :memberffrom Asaid pair of longitudinal segment ofthe other of saidstructural sections, Y i

(-k) and -resilient mean'smounted on usaidjhirdjprojecting `member portionon the cover member adaptedv to slidingly overlie-,and engage vsaid otherstructural section to forma sealfbetweens'aidstructural Vsection l' andthe cover member@ 3. Ail-expansion joint Cover assembly'for structural sections disposed inspacfed relationship anddeiining an "elongated joint therebetween wherein Vsaid'strt'ictural sections are disposed' in perpendicular relationship, said ias'- 1 y sembly comprising,

(a) an elongated relatively'rigid basemember adaptedV j to be mountedon theV outer face of one of the structural Vsections `adjacent theA margin thereof, Y

" (b) `a longitudinally extending-planar portioniextending "from said baselmernber in-,overlyingvrelation toy the joint between the structural sections and a longi- @mamey to' en Yisnt, 11

lof-the base member and engaging the resilient mem-.

" -rnemberportions thereon and adapted to overlie said j, ttudinalV segment of the other: structural v section jin j (c) an elongate resilient member carried by said base member adjacent said planar portion,

(d) a longitudinally extending latch member portion on said planar portion in transversely spaced relation to said base member,

(e) a cover member of generally transversely L- shaped configuration and having first and second planar elements,

(f) transversely spaced first and second member portions on the first planar element extending toward said base member,

(g) said first member portion on the cover member having a portion engaging the resilient member whereby said resilient member moves and urges said cover member toward the latch member portion on the planar portion of the base member,

(l1) said second member portion on the first planar element of the cover member having means to complementarily and releasably engage the latch member on the planar portion of the base member in response to movement of the cover member toward said latch member and cooperating with the resilient member to releasably mount the cover member on said base member,

(i) said second planar element of the cover member being disposed in overlying relation to the base member,

(j) other memberportions on the first and second planar elements of the cover member adjacent the longitudinal terminal edges thereof positioned outwardly of and in proximity to the adjacent longitudinal terminal edges of the base member and planar portion thereof, said other member portions extending toward said base member,

(k) andresilient seal means carried by one of said other extending member portions adjacent the terminal edges of the first and second planar elements of the cover member `and adapted to resiliently and slidingly overlie the adjacent structural section to form a seal between said cover member and the structural section.

4. An expansion joint cover assembly for structural sections disposed in spaced relationship and defining an elongated joint therebetween, said assembly comprising,

(a) an elongated relatively rigid base member adapted -to be mounted on the outer face of one of the structural sections adjacent the margin thereof,

(b) spaced longitudinally extending first and second member portions on said base member and projecting outwardly therefrom,

(c) an elongated relatively rigid cover member overlying said base member and having a Vwidth extending laterally therebeyond to overlie the joint between said structural sections and a longitudinal segment of the other structural section in proximity to said Y joint, Y

(d) said cover member having a plurality of laterally spaced longitudinally `extending member portions projecting toward said Vbase member,

(e) a pair of said member portions on the cover member being positioned Vwith one adjacent said first member portion and the other adjacent said second member portion of the base member with the cover member movable laterally of the base member,

(f) laterally projecting means on each .of said pair of member portions of the cover member and said first and second member portions of the base member' and extending longitudinally thereof in spaced relation to the respective base and cover members with said projecting means of the cover member between the base member and the projecting means on the first and second member portions thereof and in interlocking engagement therewith in one lateral position of the cover member relativeA to the base E member to resist removal of the cover member from the base member,

(g) and an elongate longitudinally extending resilient member positioned at one of said first and second member portions of the base member between the laterally projecting means thereon and the base member and engaged by the laterally projecting means on the adjacent of said pair of member portions on the cover member so said resilient member urges the cover member to said one lateral position wherein said interlocking engagement retains the covermember on the base member, lateral movement of the cover member relative to the base member to compress said resilient member releasing the interlocking engagement of the laterally projecting v means on the other of said first and second member portions and the pair of member portions on the cover member to permit removal of the cover member from the base member.

5. An assembly as set forth in claim 4 adapted to be mounted on a pair of structural sections disposed in perpendicular relationship and wherein,

(a) said cover member and base member are each of generally transversely L-shaped configuration provided with first and second planar elements,

(b) said pair of member portions on the cover member being on one of said planar elements thereof, (c) said first member portion of the base member being on one and the second member portion being on the other of theplanar elements thereof.

6. An expansion joint cover assembly for structural sections disposed in spaced relationship and defining an elongated joint therebetween, said assembly comprising,

(a) an elongated relatively rigid base member adapted to be mounted on the outer face of one of the structural sections adjacent the margin thereof,

(b) spaced longitudinally extending first and second member portions on said base member and projecting outwardly therefrom,

(c) a lateral leg on said first member portion spaced from said base member and extending toward the second member portion,

(d) an elongated relatively rigid cover member overlying said base member and having a width extending laterally therebeyond to overlie the joint between said structural sections and a longitudinal segment of the other structural section in proximity to said joint,

(e) said cover member having a plurality of laterally spaced longitudinally extending member portions projecting toward said base member,

(f) a pair'of said member portions on the cover member being inwardly of said first and second member portions on the base member and having lateral spacing for insertion therebetween and lateral movement relative to the base member, i

(g) one of said pair of member portions on the cover member having an elongate laterally projecting portion extending between the base member and the lateral leg on said first member portion when the cover member is mounted on said base member,

(h) the other of said pair of member portions on the cover and said second member portion on the base member havinglaterally projecting members which inter-engage in response to lateral movement of the cover toward said second member portion and cooperate with said lateral leg and laterally projecting portion on the respective first member portion and saidone of the pair of member portions on the cover in removably retaining the cover member on the base member,

(i) and an elongate longitudinally extending resilient` member at said first member between the lateral leg thereonand said base member and engaged by the 9 j y Y l@ lateral projecting Vportion of said one of the pair of i (b) Vsaid pair of member portions onV thel cover memmember portions on the vcover urging the coverk ber being on the second of said planar elements member into said retained position on the base thereof and overlying the second planar element of member, l Y v the'base'member, j Y l Y (i) fa third of said projecting longitudinallyY extend- 5 (c) Vsaid third member portion on the cover meming member portions spaced transversely ofthe cover ber being on said one planar element of the cover member from said pair of member portions theremember adjacent the longitudinal terminal edge. on and adapted to overlie said segment of said f other structural section References Cited by the Examiner 7. An assembly as set forth in claim 6 adapted to be 10 UNITED STATES PATENTS mounted on apair of Vstructural sections 4disposed in per- Y1 758 720 5 /30 Sodergre-n i '16@392 pendicular relationship and wherein, v i i 4 2877514 3/59 Mears T- 20 52 5 (a) said cover memberyand base member .are each 2917792 12/59 Franzbl-gtgl- 20 52'2 of generally transversely L-shaped conguration proi 2948994 8/60 Thom 50 434 vided with first and second planar elements with 15 the virst planar element of the base member adapted y ,2999040 Y 6/61 to be `mounted on one structural section and the seci ond planar element of the base member overlyingv the EARL J' WITMER Primary Examiner ,f l second structural section with the first and second JACOB L. NACKENOFF, BENJAMIN BENDETT, .member portions being on the second planar ele- 20 -Y 1 Y Y Examiners. Vment of the base member,

Stevensonv 18g-,75kv Y 

1. AN EXPANSION JOINT COVER ASSEMBLY FOR STRUCTURAL SECTIONS DISPOSED IN SPACED RELATIONSHIP AND DEFINING AN ELONGATED JOINT THEREBETWEEN, SAID ASSEMBLY COMPRISING, (A) AN ELONGATED RELATIVELY RIGID BASE MEMBER ADAPTED TO BE MOUNTED ON THE OUTER FACE OF ONE OF THE STRUCTURAL SECTIONS ADJACENT THE MARGIN THEREOF; (B) SPACED LONGITUDINALLY EXTENDING FIRST AND SECOND MEMBER PORTIONS ON SAID BASE MEMBER AND PROJECTING OUTWARDLY THEREFROM, (C) ONE OF SAID FIRST AND SECOND MEMBER PORTIONS HAVING AN EXTENSION TOWARD THE OTHER OF SAID MEMBER PORTIONS AND COOPERATING WITH THE BASE MEMBER TO DEFINE A LONGITUDINALLY EXTENDING CAVITY, (D) THE SECOND OF SAID MEMBER PORTIONS HAVING AN EXTENSION TOWARD THE FIRST MEMBER PORTION AND DEFINING A LEDGE FACING THE BASE MEMBER AND SPACED THEREFROM, (E) AN ELONGATE RESILIENT MEMBER POSITION IN SAID CAVITY BETWEEN THE FIRST MEMBER EXTENSION AND THE BASE MEMBER AND HAVING A FACE EXPOSED TOWARD SAID SECOND MEMBER PORTION, 